一种提高彩色电视机彩色逼真度的联控电路

一、引言单片机已广泛地应用于工业自动化过程的实时控制和数据处理。但是,由于单片机的计算功能有限,难以进行复杂的数据处理。所以,对复杂的数据处理常借助于IBM PC机来完成,而单片机主要完成一些较直接的数据处理和控制功能。为了保证控制和数据处理的实时性,单片机与IBM PC机的快速数据通信就成为一个首先必须解决的问题。本文就是针对这一情况,介绍了一种单片机与IBM PC机的DMA数据传输方法。该方法利用IBM PC主机板上已有的DMA资源,具有接口电路简单、编程容易、数据传输快和可靠性高等优点。     

基于CAN总线的网络监控系统

CAN(Controller Area Network)总线属于现场总线(field Bus)的范畴。介绍一种基于CAN总线的网络监控系统方案。该系统由上位机(PC机)、下位机(单片机F040)组成，采用CAN卡和单片机本身集成的CAN模块作为上、下位机通讯接口。上位机与CAN卡的接口采用VB编写，本文还给出了单片机中CAN模块通信的数据处理方法。     

PC机和80C196KC单片机之间串行通信的实现

介绍了一种湿型砂质量测试系统中PC机和 80C196KC单片机之间串行通信的实现方法。该方法是基于WINDOWS开发环境 ,依据RS - 2 32串行通信协议 ,运用VisualC 6 .0提供的通信控件MSCOMM和汇编语言得以实现的 ,它能够及时地把 80C196KC单片机采集到的原始数据传送至PC机 ,在PC机进行数据处理完后又将处理结果送回 80C196KC单片机 ,从而实现了PC机与 80C196KC单片机之间原始数据和处理结果的有效传送。     

用于检测复合材料结构状态的智能光电系统

设计了一种能够实时在线检测复合材料内部结构状态的智能光电系统,详细介绍了微弱光电流信号调理电路的设计.该系统以光纤作为传感器、CD4051为多路模拟开关、AD0801实现A/D转换、89C51单片机为微处理器.PC机与单片机通信,完成数据处理并实现故障点的定位.     

用于检测复合材料结构状态的智能光电系统

设计了一种能够实时在线检测复合材料内部结构状态的智能光电系统,详细介绍了微弱光电流信号调 理电路的设计。该系统以光纤作为传感器、CD4051为多路模拟开关、AD0801实现A/D转换、89C51 单片机为微处理器。PC机与单片机通信,完成数据处理并实现故障点的定位。     

基于单片机控制的点阵汉字显示屏

介绍了基于AT89C51单片机的汉字显示系统。该系统由控制、显示、存储和通信电路组成，其中该显示屏可利用AT89C51的串行口和电平转换芯片和PC机进行通信，并能通过PC机与单片机进行通信以实时修改其显示内容。     

无线体温监测系统的研究和实现

本文介绍了一种适于医用的电子体温监测系统的设计及实现过程.该系统以AT89C2051单片机为控制核心,以PTR2000为无线通讯部件,采用信号检测、数据处理和无线传输技术实现人体的体温在PC机中的实时监测.     

智能考核与训练系统通信接口的设计与实现

本文以电子设备故障检修技能考核与训练智能化系统为例,介绍由一台PC机与多台单片机组成的主从式网络通信系统,单片机控制作为下位机,负责对电子设备故障点进行数据采集和控制,通过接口将结果传给PC机：PC机作为上位机,对数据进行分析和处理,根据分析和处理的结果来控制单片机的操作。     

钢轨超声探伤数据记录系统的设计

介绍了由PC机、单片机、GPS模块构成的钢轨超声探伤数据记录系统的组成、工作原理和实现方法，给出了数据处理软件的设计思路。该系统能对手推车式钢轨探伤仪的仪器运行状况、作业过程进行实时监测与记录，为钢轨探伤作业的科学有效管理提供了一种技术手段。     

在计算机控制应用中直接开发单片机的一种方法

针对没有单片机开发系统或EPROM写入器无法对单片机进行开发的问题,设计了利用PC机对单片机进行直接简便开发的方法。详细介绍了80C31单片机为对象,利用PC机直接开发单片机的原理及步骤。通过PC机与单片机最小系统的异步通信,实现EPROM写入器功能。反向由单片机向PC机发送数据,使得PC机的监视器和存储器成为单片机的监视器和存储器。该方法节省了单片机开发系统和EPROM写入器等“必需品”,具有简单新颖,可灵活配置等特点,有较高的实用价值。     

A Dual Six-Port Network Analyzer Using Diode Detectors

The performance of a dual six-port network analyzer using diode detectors is described. The network analyzer operates over the 2-18-GHz band using commercially available low-barrier Schottky diodes. The paper describes the process for calibrating the diodes for deviation from square law. Measurement results are presented showing the accuracy and precision of tbe six-port network analyzer when measuring 1-port and 2-port devices. Key work attenuation measurements, automated network analyzer, impedance measurements, microwave network analyzer, network analyzer, and six-port.     

矢量网络分析仪在测量传输矢量信号中的应用

随着科学技术的不断发展,网络分析仪从原来的标量网络分析仪到目前的矢量网络分析仪,原来只能测传输特性的增益到可测相位、群延时等参数。该文主要介绍网络分析仪的参数和几种新的测量方法。     

基于LabVIEW的虚拟信号分析仪的设计与研究

针对传统信号分析仪价格昂贵,体积庞大等特点,本文从理论上介绍了信号分析仪的工作原理,提出并设计了一种基于图形化编程软件LabVIEW8.6平台的虚拟信号分析仪。该虚拟信号分析仪采用模块化设计,文中首先介绍了该虚拟信号分析仪的设计思路,并具体阐述了所设计的虚拟信号分析仪的整体功能及其所包含的各个子模块的具体功能和设计方法。最后利用计算机仿真验证了该虚拟信号分析仪的功能。本研究对于虚拟仪器的开发设计有一定的参考作用。     

TFAS (a tophat for all species): design and computer optimizationof a new electrostatic analyzer

TFAS (tophat for all species) is discussed. It is a 360° field-of-view electrostatic analyzer that can process particles of either charge simultaneously. The TFAS analyzer resembles two tophat analyzers placed hat to hat, but with the tophat plates removed and the tophat region shared in common by both analyzers. In the tophat region, deflection is by parallel plates, one with potential +V and the other with potential -V. A collimator allows particles to enter this parallel plate region and the particles are then deflected into the spherical deflection region of the analyzer. The TFAS has characteristics comparable to the spherical tophat analyzer. A mathematical analysis is presented showing the optimal dimensions selection for the TFAS analyzer, given a particular tophat angle. Raytracing simulations have been performed. Design curves showing various analyzer characteristics as a function of tophat angle are presented. The design curves are compared to similar curves already in the literature for the spherical tophat analyzer. Differences between the TFAS analyzer and the spherical tophat analyzer are summarized     

频谱仪灵敏度分析及小信号测量的修正

简述了超外差式频谱分析仪的组成及其工作原理,论述了微波频谱分析仪灵敏度的基本概念,给出了频谱分析仪灵敏度的计算公式,讨论了频谱分析仪灵敏度与噪声系数、分辨带宽和射频衰减的关系。研究了改善微波频谱分析仪灵敏度的方法:降低噪声系数法、压窄分辨带宽法和减小射频衰减法。讨论了频谱分析仪本底噪声对小信号测量影响的修正方法。     

傅里叶磁光谱仪中的起偏器和检偏器的自动定位及误差分析

在傅里叶变换型磁光谱仪中，起偏器和检偏器的初始方位通常需要在测量前预先定位。提出了一种不需要专门对起偏器和检偏器定位即可完成磁光谱的测量计算的新方法，该方法可以计算出起偏器和检偏器的初始角度值，从而进行自动校准。推导了检偏器旋转角度偏差导致磁光偏转角测量误差的理论公式，并进行了数值分析，给出了测量误差与旋转步数的关系，数值结果表明检偏器角度偏差引起的误差与步数的平方根成反比关系。还给出了一个钴膜样品的磁光克尔角随外加磁场变化的实测曲线。     

Utilisation d’un analyseur syntaxique pour la reconnaissance de la parole continue

The author describes the syntactic analyzer which is used in the system keal for continuous speech recognition. After detection of the words in an utterance by a lexical analyzer, the syntactic analyzer builds all the possible syntactic structures according to a context free grammar previously defined by means of a compiled metalanguage. This analyzer allows, in some cases, to correct some errors such as omission and insertion of phonemes by the phonemic analyzer, or non-detection of short words by the lexical analyzer. This program enables presently the recognition of 65 % of utterances in simple dialogs. A few seconds are enough to recognize a sentence.     

A new LMS-based Fourier analyzer in the presence of frequency mismatch and applications

The performance of the conventional least mean square (LMS) Fourier analyzer may degenerate significantly, if the signal frequencies given to the analyzer are different from the true signal frequencies. This difference is referred to as frequency mismatch (FM). We first analyze the performance of the conventional LMS Fourier analyzer for a single sinusoid in the presence of FM. We derive the dynamics and steady-state properties of this analyzer as well as the optimum step size parameter which minimizes the influence of the FM. Extensive simulations reveal the validity of the analytical results. Next, a new LMS-based Fourier analyzer is proposed which simultaneously estimates the discrete Fourier coefficients (DFCs) and accommodates the FM. This new analyzer can very well compensate for the performance degeneration due to the FM. Applications to estimation/detection of dual-tone multiple frequencies (DTMF) signals and analysis of real-life noise signals generated by a large-scale factory cutting machine are provided to demonstrate the excellent performance of our new Fourier analyzer.     

Designing of Acousto—optic Spectrum Analyzer

The structure of the acousto- optic spectrum analyzer was investigated including the RF amplifying circuit, the optical structures and the postprocessing circuit, and the design idea of the module was applied to design the spectrum analyzer. The modularization spectrum analyzer takes on the performance stabilization and higher reliability, and according to different demands, the different modules can be used. The spectrum analyzer had such performances as the detecting frequency precision of 1 MHz, the detecting frequency error of 0.58 MHz, detecting responsivity of 90 dBm and bandwidth of 50 MHz.     

网络分析仪数据处理分析

在分析讨论了网络分析仪数据处理过程的基础上,提出了线性内插算法,并用具有两种扫描方式的网络分析仪对算法进行验证。结果表明：通过线性内插算法,两种扫描方式得到的5参数测量值之间的差值与定制频率扫描方式下测量值的标准偏差相近,因此能较好地解决频率点不一致带来的问题;此外,也为分析相位测量数据异常提供了有力的工具。